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Suryanarayanan, R.; Gasumyants, V. É.; Ageev, N.V.

doi:10.1103/physrevb.59.r9019

Cited by 25 publications

(17 citation statements)

References 35 publications

(26 reference statements)

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“…DOI Spin caloritronic effects have been extensively studied using integral (homogeneous) thermal gradients [1,2]. In ferromagnetic conductors exposed to a thermal gradient in the Nernst geometry, one observes the anomalous Nernst effect (ANE), which describes the occurrence of an electric field E ANE / ÀM Â rT, perpendicular to both the temperature gradient rT and the magnetization M. The anomalous Nernst effect has been studied in a variety of ferromagnetic thin film metals [3,4], oxides [4,5], spinels [4,6,7], and diluted magnetic semiconductors [8]. In analogy to charge-based caloritronic effects, the recently discovered spin Seebeck effect (SSE) [9] describes the generation of a spin current J s parallel to an applied temperature gradient rT in ferromagnetic materials.…”

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Local Charge and Spin Currents in Magnetothermal Landscapes

et al. 2012

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A scannable laser beam is used to generate local thermal gradients in metallic (Co2FeAl) or insulating (Y3Fe5O12) ferromagnetic thin films. We study the resulting local charge and spin currents that arise due to the anomalous Nernst effect (ANE) and the spin Seebeck effect (SSE), respectively. In the local ANE experiments, we detect the voltage in the Co2FeAl thin film plane as a function of the laser-spot position and external magnetic field magnitude and orientation. The local SSE effect is detected in a similar fashion by exploiting the inverse spin Hall effect in a Pt layer deposited on top of the Y3Fe5O12. Our findings establish local thermal spin and charge current generation as well as spin caloritronic domain imaging.

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confidence: 99%

Local Charge and Spin Currents in Magnetothermal Landscapes

et al. 2012

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“…Fermi level (EF). 15 The increase in Sxy with decreasing temperature in the paramagnetic state is due to decrease in hopping frequency of small polarons between neighboring Mn sites and hence to the increase in τ. As ferromagnetism sets in at TC, the conduction electron band width widens and the mobility of small polarons suddenly increases which results in peak of…”

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confidence: 99%

Skew scattering dominated anomalous Nernst effect in La1-xNaxMnO3

Ghosh

Das

Mahendiran

2019

Journal of Applied Physics

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We report the anomalous Nernst effect (ANE), i.e. creation of electrical voltage transverse to the direction of applied temperature gradient and magnetic field in bulk samples of La1-xNaxMnO3 (x = 0.02, 0.05, 0.1 and 0.3) whose ferromagnetic Cure temperature(TC) varies from 251 K for x = 0.02 to 310 K for x = 0.3. We measured both the magnetic field and temperature dependences of ANE. While ANE is negligible much above TC, it increases rapidly at TC and exhibits a peak just below it. The field dependence of ANE closely follows magnetization. The maximum value of ANE at TC increases from x = 0.02 to 0.1, but decreases significantly for x = 0.3. Besides ANE, we also measured dc resistivity and longitudinal Seebeck coefficient as a function of temperature and used these data to analyze our results. Our data analysis indicates that skew scattering is the main source of the ANE in these oxides.

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“…Besides a few other metallic alloys, colossal magnetoresistive manganites are also considered to be promising candidates for magnetic refrigeration due to the low cost of synthesis, chemical stability and high magnetic entropy change. 2 Another promising and simple technology for magnetic refrigeration is the Ettingshausen effect, which refers to the induction of a temperature gradient in a current carrying sample in a direction perpendicular to the direction of the Although there are a few reports on the Nernst effect in manganites, 6 i.e., induction of a transverse voltage in a sample subjected to a temperature gradient perpendicular to H, possibility of magnetic cooling in presence of a dc current has been rarely studied. probes separated by 4 mm.…”

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Magnetothermal cooling with a phase separated manganite

Rebello

Mahendiran

2009

Applied Physics Letters

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We show that temperature of a current (I = 20 mA) carrying manganite (Nd 0.5 Ca 0.5 Mn 0.93 Ni 0.07 O 3 ) in presence of a magnetic field (H) decreases abruptly as much as ΔT = 45 K (7 K) accompanied by a step like decrease in magnetoresistance at a critical value of H when the base temperature is 40 K (100 K). The magnitude of ΔT and the position of magnetoresistance step decrease towards lower H with decreasing amplitude of the current. We discuss possible origins of the current and magnetic-field driven temperature change which may find applications in magnetothermal refrigeration besides magnetocaloric effect.

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Anomalous Nernst effect inLa0.88MnO3

Cited by 25 publications

References 35 publications

Local Charge and Spin Currents in Magnetothermal Landscapes

Local Charge and Spin Currents in Magnetothermal Landscapes

Skew scattering dominated anomalous Nernst effect in La1-xNaxMnO3

Magnetothermal cooling with a phase separated manganite

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